Reindent fs/vfs/main.cc

main.cc was still using tab characters instead of spaces as our coding
conventions dictate. Reindent it, using Eclipse's ctrl-I.
This patch doesn't change anything else.

Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>